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967 

WWUS20 KWNS 262303

SEL7

SPC WW 262303

NEZ000-SDZ000-270400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 417

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT TUE JUL 26 2016



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  NORTH CENTRAL NEBRASKA

  SOUTH CENTRAL AND SOUTHWEST SOUTH DAKOTA



* EFFECTIVE THIS TUESDAY EVENING FROM 605 PM UNTIL 1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



SUMMARY...CLUSTERS OF STORMS HAVE FORMED ALONG A RESIDUAL BOUNDARY

ACROSS SOUTHERN SOUTH DAKOTA...IN AN ENVIRONMENT SUPPORTIVE OF

ORGANIZED MULTICELL CLUSTERS AND SOME SUPERCELL STRUCTURES.  OTHER

MORE ISOLATED STORMS MAY ALSO SPREAD SOUTHEASTWARD FROM THE BLACK

HILLS INTO SOUTHWEST SOUTH DAKOTA.  THE SOUTH CENTRAL SOUTH DAKOTA

STORMS COULD COALESCE AND GROW UPSCALE INTO A LARGER CLUSTER THIS

EVENING WHILE SPREADING INTO NORTHERN NEBRASKA.  DAMAGING WINDS AND

LARGE HAIL WILL BE POSSIBLE WITH THE STRONGEST STORMS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 110 MILES WEST OF

VALENTINE NEBRASKA TO 55 MILES SOUTH SOUTHEAST OF CHAMBERLAIN

SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



&&



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 32020.





...THOMPSON

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